Fixed #10913 -- Documented how related_name affects QuerySet filtering

Thanks neithere for the suggestion.
Initial version of MigrationOptimizer and tests
Fixed #16919 -- Passed user to set_password_form in GET requests.

Thanks Jaime Irurzun for the report and initial patch and
ejucovy for the test.
Fixed #21165 -- Fix test for syndication feed timestamp field on Windows.

Thanks Michael Manfre for the report, Raphaël Barrois for the patch and
Claude Paroz, Aymeric Augustin for the reviews.

Refs #7936.
Fixed #19182 -- Fixed ModelAdmin.lookup_allowed to work with ('fieldname', SimpleListFilter) syntax.

Thanks gauss for the report.
Fixed #21216 -- Allow `OneToOneField` reverse accessor to be hidden.
Fixed #19277 -- Added LocaleMiddleware.response_redirect_class

Thanks ppetrid at yawd.eu for the suggestion.
Fixed #21218 -- Typo on docs/howto/upgrade-version.txt

Thanks ryan at ryangallen.com for the report.
Fixed #19321 -- Allowed redirect middleware HTTP responses to be overridden.

Thanks Melevir for the suggestion.
Fixed #21213 -- Added docs for Django's mailing lists.

Added docs/internals/mailing-lists.txt documenting the use of django's
mailing lists. All references across docs changed to point to this page.

The referencing makes use of substitution because there's no way to make
a :ref: link in a non-inline fashion in Sphinx. It also makes use of
rst_epilog Sphinx conf for making this substitutions across all the
docs.
Fixed #6681 -- Don't break docutils when rendering reStructuredText.

Don't set a global default interpreted role function for reStructuredText.
Instead, use the `default-role` directive to change the default only within
the `parse_rst()` function.

Thanks Malcolm Tredinnick for the report.
Fixed #11277 -- Hid labels of fields with HiddenInput widget in admin forms.

Thanks bartTC for the report.
Fixed #21217 -- Avoid connecting `(pre|post)_init` signals to abstract senders.
Fixed #21189: Cleaned up usage of bare except clauses.

Thanks to berkerpeksag for the report and to claudep
for the review.
Fixed #21150 -- select_related + annotate join promotion failure

Added tests for a .annotate().select_related() join promotion failure.
This happened to work on master but was currently untested.
Improved Query join promotion logic

There were multiple cases where join promotion was a bit too aggressive.
This resulted in using outer joins where not necessary.

Refs #21150.
Fixed #21161 -- Timezone-related tests on Windows.

Thanks Xelnor for the patch.
Simplified a test by using CapturedQueriesContext
Fixed #18414 -- qs.exists() for sliced distinct queries
Fixed #21174 -- transaction control in related manager methods